U.S.  G.S.  A.-G.I.    Form  No.  174  Issued  February,  1927 


U.  S.  Department  of  Agriculture 

Bureau  of  Agricultural  Economics 


Handbook 

of 

United  States  Grades 

for 

Rough  Rice 


I 
Revised  a$JE»egffii^(3«a2<lBfiyi927 


United  States 

Government  Printing  Office 

Washington 

1927 


CONTENTS 

Page 
Rough  rice  grades 1 

Class  and  grade  requirements  for — 

Honduras,  Edith,  Fortuna,  Caro- 
lina, Lady  Wright,  Blue  Rose, 
Early  Prolific,  and  Japan  rough 

rice : 1-3 

California  Japan  rough  rice_ 4-5 

Grades  for  mixed  rough  rice 6 

Grades  for  damp  and  wet  rice 7 

Grades  for  seedy  and  very  seedy  rough 

rice 8-9 

Grades  for  weevily  rice 9 

Grades  for  stained,  mud-dragged,  and 

musty  rice 10 

Milling  quality 11 

Definitions 12-14 

Important  features  of  grading  rough  rice__     15 

Sampling  of  rough  rice 15-20 

Method  of  making  moisture  tests 21-25 

Determination  of  milling  quality 26 

Smith  shelling  device 26-28 

Bates  laboratory  aspirator 28-29 

Determination  of  foreign  material  and 

finely  broken  kernels 3 1-34 

Apparatus  for  grading  rough  rice —  35-37 


U.S.G.S.A.-G.I.    Form  No.  174  Issued  February,  1927 

U.  S.  Department  of  Agriculture 

Bureau  of  Agricultural  Economics 


Handbook  of 
United  States  Grades 

for 

Rough  Rice 


As  revised 
Effective  March  1,  1927 


COMPILED  BY 

E.G.BOERNER 
I  n  charge,  Grain  Investigations 

W.D.SMITH 

In  charge,  Rice  Investigations 

R.M.GEHL 
Rice  Investigations,  Grain  Division 


United  States 

Government  Printing  Office 

Washington 

1927 


ADDITIONAL  COPIES 

OF  THIS  PUBLICATION  MAY  BE  PROCURED  FROM 

THE   SUPERINTENDENT  OF  DOCUMENTS 

GOVERNMENT  PRINTING  OFFICE 

WASHINGTON,  D.  C. 

AT 

10  CENTS  PER  COPY 


UNITED  STATES  GRADES  FOR 
ROUGH  RICE 


For  the  purposes  of  the  United  States  grades 
for  rough  rice: 

Rough  rice. — Rough  rice  shall  be  rice  grown 
in  continental  United  States  which  contains  not 
less  than  50  per  cent  of  kernels  of  rice  from 
which  the  hulls  have  not  been  removed,  and 
which  may  contain  not  more  than  50  per  cent 
of  matter  other  than  rice  and  not  more  than  10 
per  cent  of  cereal  grains  of  a  kind  or  kinds  other 
than  rice. 

HONDURAS  ROUGH  RICE  (CLASS  I) 

This  class  shall  include  the  rices  known 
commercially  as  Honduras  and  Mortgage  Lifter, 
and  may  include  not  more  than  10  per  cent  of 
whole  kernels  of  rice  of  any  other  class  or  classes. 

EDITH  ROUGH  RICE  (CLASS  H) 

This  class  shall  include  the  rice  known  com- 
mercially as  Edith,  and  may  include  not  more 
than  10  per  cent  of  wrhole  kernels  of  rice  of  any 
other  class  or  classes. 

FORTUNA  ROUGH  RICE  (CLASS  TO) 

This  class  shall  include  the  rice  known  com- 
mercially as  Fortuna,  and  may  include  not  more 
than  10  per  cent  of  whole  kernels  of  rice  of  any 
other  class  or  classes. 

CAROLINA  ROUGH  RICE  (CLASS  IV) 

This  class  shall  include  the  rices  known  com- 
mercially as  Carolina  and  Storm  Proof,  and 
may  include  not  more  than  10  per  cent  of  whole 
kernels  of  rice  of  any  other  class  or  classes. 

1 


LADY  WRIGHT  ROUGH  RICE  (CLASS  V) 

This  class  shall  include  the  rice  known  com- 
mercially as  Lady  Wright,  and  may  include 
not  more  than  10  per  cent  of  whole  kernels  of 
rice  of  any  other  class  or  classes. 

BLUE  ROSE  ROUGH  RICE  (CLASS  VI) 

This  class  shall  include  the  rices  known  com- 
mercially as  Blue  Rose,  Greater  Blue  Rose,  and 
Improved  Blue  Rose,  and  may  include  not  more 
than  10  per  cent  of  whole  kernels  of  rice  of  any 
other  class  or  classes. 

EARLY  PROLIFIC  ROUGH  RICE  (CLASS  VH) 

This  class  shall  include  the  rice  known  com- 
mercially as  Early  Prolific,  and  may  include  not 
more  than  10  per  cent  of  whole  kernels  of  rice 
of  any  other  class  or  classes. 

JAPAN  ROUGH  RICE  (CLASS  VHI) 

This  class  shall  include  the  rices  known  com- 
mercially as  Japan,  and  may  include  not  more 
than  10  per  cent  of  whole  kernels  of  rice  of  any 
other  class  or  classes.  This  class  shall  be 
divided  into  two  subclasses  designated  as  (a) 
Japan  rough  rice,  and  (b)  California- Japan 
rough  rice. 

SUBCLASS    (A)    JAPAN    ROUGH    RICE 

This  subclass  shall  include  all  rices  known 
commercially  as  Japan  possessing  the  charac- 
teristics of  rice  of  this  class  as  grown  east  of  the 
Rocky  Mountains. 

2 


Grade  requirements  for  the  classes  Hofiduras, 
Edith,  Fort  una,  Carolina,  Lady  Wright,  Blue 
Rose,  and  Early  Prolific  rough  rice,  and  for  the 
subclass  Japan  rough  rice 


Grade  Xo.1 


l 
2 

3 
4 
5 

G 


Da: 
kernels 


Total 


,ct. 

2 

4 

7 

10 

15 

15 


dam- 
age 


Red 
rice 


Foreign  man : 
finely  broken  kernels 


Sepa- 
rable 


P.ct. 

P.ct. 

0.0 

0.5 

.1 

3.0 

.2 

6.0 

.3 

10.0 

.4 

20.0 

•  5 

CO.O 

I 

2 

4 

7 

10 

15 

15 


Inseparable 


Mud 
lumps 


0.0 

.1 
o 

.   mi 

.3 

.5 

1.0 


Cereal 
grains 


P.ct. 
0.0 
.1 
.2 
.3 
.5 
1.0 


Rice  of 

other 
classes 


1 
2 
4 
6 
1C 
10 


Sample     Sample  grade  shall  be  rough  rice  of  the  class  Ilon- 
grade.  duras,  or  Edith,  or  Fortuna,  or  Carolina,  or  Lady 

Wright,  or  Blue  Rose,  or  Early  Prolific,  or  the 
subclass  Japan,  respectively,  which  does  not  come 
within  the  requirements  for  any  of  the  grades 
from  Xo.  1  to  Xo.  6,  inclusive,  or  which  has  any 
commercially  objectionable  foreign  odor,  or  is 
sour,  heating,  or  hot,  or  is  otherwise  of  distinctly 
low  quality. 


1  For  special  grade  designations  for  weevily,  damp,  wet,  seedy, 
very  seedy,  mud-dragged,  stained,  and  musty  rough  rice  see 
specifications  given  on  pp.  7  to  10,  inclusive. 

The  rough  rice  in  each  grade  above  sample  grade  shall  be  cool. 


SUBCLASS  (B)  CALIFORNIA-JAPAN  ROUGH  RICE 

This  subclass  shall  include  all  rices  known 
commercially  as  Japan  possessing  the  charac- 
teristics of  rice  of  this  class  as  grown  wes,t  of 
the  Great  Plains  area  of  the  United  States. 


Grade   requirements  for   the   subclass   California' 

Japan  rough  rice 


Damaged 

kernels 

Red 

Fomiin  material  and 

finely  broken  kcriul- 

Grade  No.1 

Total 

dam- 
age 

Sepa- 
rable 

Inseparable  l 

Rice  of 

other 
clisses 

Mud 
lumps 

<  ''Teal 
grains 

1 

P.ct. 

0.2 

.4 

.7 
1.0 
1.5 
2.0 

P.ct. 
0.0 
.1 
.2 
.3 
.4 
.5 

P.ct. 
0.1 
.2 
.5 
1.0 
2.0 
5.0 

P.ct. 

2 

4 

7 

10 

15 

20 

P.ct. 

0.0 
.1 
.2 
.3 
.5. 

1.0 

P.ct. 

0.0 
.1 
.2 
.3 
.5 

1.0 

P.ct. 
0.1 

2 

.2 

3 

.4 

4 

.6 

5 

1.0 

6 

1.0 

Sample 
grade. 


Sample  grade  shall  be  rough  rice  of  the  subclass 
California- Japan  which  does  not  come  within 
the  requirements  for  any  of  the  grades  from 
No.  1  to  Xo.  6,  inclusive  or  which  has  any 
commercially  objectionable  foreign  odor,  or  is 
sour,  heating,  or  hot,  or  is  otherwise  of  distinctly 
low  quality. 


1  For  special  grade  designations  for  weevily,  damp  wet, 
seedy,  very  seedy,  mud-dragged,  stained,  and  musty  rough 
rice  see  specifications  given  on  pp.  7  to  10,  inclusive. 

The  rough  rice  in  each  grade  above  sample  grade  shall  be  cool. 


GRADES  FOR  MIXED  ROUGH  RICE 

Mixed  rough  rice. — Mixed  rough  rice  shall 
be  a  mixture  of  any  two  or  more  of  Classes  I, 
II,  III,  IV,  V,  VI,  VII,  and  VIII  which  does 
not  meet  the  requirements  of  any  one  of  such 
classes. 

Mixed  rough  rice  shall  be  graded  according 
to  each  of  the  grade  requirements  common  to 
the  class  or  subclass  of  rough  rice  which  pre- 
dominates over  each  other  class  or  subclass  in 
the  mixture,  except  that  all  of  the  grade  require- 
ments in  any  class  as  to  the  maximum  per- 
centages of  other  rices  shall  be  disregarded. 
The  grade  designation  of  mixed  rough  rice  shall 
include,  successively,  in  the  order  named,  the 
number  of  the  grade,  the  word  "  mixed,"  and, 
in  the  order  of  its  predominance,  the  name  and 
approximate  percentage  of  each  class  or  sub- 
class of  rough  rice  which  constitutes  10  per  cent 
or  more  of  the  mixture;  but  if  only  one  class 
or  subclass  exceeds  10  per  cent  of  the  mixture 
the  name  and  approximate  percentage  of  that 
class  or  subclass  shall  be  added  to  the  grade 
designation,  followed  by  the  name  and  approxi- 
mate percentage  of  at  least  one  other  class  or 
subclass. 


6 


GRADES   FOR   DAMP    AND    WET    ROUGH 

RICE 

DAMP  ROUGH  RICE 

In  the  case  of  rice  other  than  of  the  subclass 
California-Japan  rough  rice  all  rough  rice  con- 
taining more  than  14  per  cent  but  not  more  than 
15.5  per  cent  of  moisture  shall  be  considered 
damp. 

In  the  case  of  rice  of  the  subclass  California- 
Japan  rough  rice  all  rough  rice  containing  more 
than  15  per  cent  but  not  more  than  16  per  cent 
of  moisture  shall  be  considered  damp. 

Damp  rough  rice  shall  be  graded  and  desig- 
nated according  to  the  grade  requirements  of 
the  grade  applicable  to  such  rice  if  it  were  not 
damp,  and  there  shall  be  added  to  and  made  a 
part  of  such  grade  designation  the  word  "damp." 

WET  ROUGH  RICE 

ill  the  case  of  rice  other  than  of  the  subclass 
California-Japan  rough  rice  all  rough  rice  con- 
taining more  than  15.5  per  cent  but  not  more 
than  17  per  cent  of  moisture  shall  be  considered 
wet. 

In  the  case  of  rice  of  the  subclass  California- 
Japan  rough  rice  all  rough  rice  containing  more 
than  16  per  cent  but  not  more  than  17  per  cent 
of  moisture  shall  be  considered  wet. 

Wet  rough  rice  shall  be  graded  and  designated 
according  to  the  grade  requirements  of  the  grade 
applicable  to  such  rice  if  it  were  not  wet,  and 
there  shall  be  added  to  and  made  a  part  of  such 
grade  designation  the  word  "wet." 

Note. — All  rough  rics  containing  more  than  17  per  cent  of 
moisture  shall  be  considered  of  low  quality  and  shall  be  graded 
"Sample  grade." 

24030°— 27 2  <7 


GRADES  FOR   SEEDY   AND   VERY   SEEDY 

ROUGH  RICE 

• 

The  determination  of  whether  rough  rice  is 
seedy,  very  seedy,  or  sample  grade  on  account 
of  seeds  shall  be  made  after  the  removal  of 
separable  foreign  material. 

SEEDY  ROUGH  RICE 

If,  after  the  removal  of  separable  foreign 
material,  in  the  case  of  rice  other  than  of  the 
subclass  California-Japan  rough  rice,  rough  rice 
contains  more  than  0.1  per  cent  but  not  more 
than  0.5  per  cent  of  weed  seeds  it  shall  be  con- 
sidered seedy. 

If,  after  the  removal  of  separable  foreign 
material,  in  the  case  of  rice  of  the  subclass  Cali- 
fornia-Japan rough  rice,  rough  rice  contains 
more  than  0.5  per  cent  but  not  more  than  1.5 
per  cent  of  weed  seeds  it  shall  be  considered 
seedy. 

Seedy  rough  rice  shall  be  graded  and  desig- 
nated according  to  the  grade  requirements  of 
the  grade  applicable  to  such  rice  if  it  were  not 
seedy,  and  there  shall  be  added  to  and  made  a 
part  of  such  grade  designation  the  word  "  seedy." 

VERY  SEEDY  ROUGH  RICE 

If,  after  the  removal  of  separable  foreign 
material,  in  the  case  of  rice  other  than  of  the 
subclass  California- Japan  rough  rice,  rough 
rice  contains  more  than  0.5  per  cent  but  not 
more  than  1  per  cent  of  weed  seeds  it  shall  be 
considered  very  seedy. 

8 


If,  after  the  removal  of  separable  foreign 
material,  in  the  case  of  rice  of  the  subclass 
California-Japan  rough  rice,  rough  rice  contains 
more  than  1.5  per  cent  but  not  more  than  3 
per  cent  of  weed  seeds  it  shall  be  considered 
very  seedy. 

Very  seedy  rough  rice  shall  be  graded  and 
designated  according  to  the  grade  requirements 
of  the  grade  applicable  to  such  rice  if  it  were  not 
verv  seedv,   and  there   shall   be   added  to   and 

ft  «.        ' 

made    a    part    of    such    grade    designation    the 
words  "very  seedy." 

Note.— If,  after  the  removal  of  separable  foreign  material,  in 
the  case  of  rice  other  than  of  the  subclass  California-Japan 
rough  rice,  rough  rice  contains  more  than  1  per  cent  of  weed 
seeds  it  shall  be  considered  of  low  quality  and  shall  be  graded 
"Sample  grade."  If,  after  the  removal  of  separable  foreign 
material,  in  the  case  of  rice  of  the  subclass  California-Japan 
rough  rice,  rough  rice  contains  more  than  3  per  cent 'of  weed 
seeds  it  shall  be  considered  of  low  quality  and  shall  be  graded 
"Sample  grade." 

GRADES  FOR  WEEVILY  ROUGH  RICE 

Weevily  rough  rice. — Weevily  rough  rice 
shall  be  all  rough  rice  which  is  infested  with  live 
weevils  or  other  insects  injurious  to  stored  rice. 

Weevily  rough  rice  shall  be  graded  and  des- 
ignated according  to  the  grade  requirements  of 
the  grade  applicable  to  such  rice  if  it  were  not 
weevilv,  and  there  shall  be  added  to  and  made  a 
part  of  such  grade  designation  the  word 
"weevily," 


9 


GRADES  FOR  STAINED,  MUD-DRAGGED, 
AND  MUSTY  ROUGH  RICE 

STAINED  ROUGH  RICE 

Stained  rough  rice  shall  be  rough  rice  which 
has  been  distinctly  discolored  by  climatic  con- 
ditions or  in  any  other  manner. 

Stained  rough  rice  shall  be  graded  and  desig- 
nated according  to  the  grade  requirements  of 
the  grade  applicable  to  such  rice  if  it  were  not 
stained,  and  there  shall  be  added  to  and  made 
a  part  of  such  grade  designation  the  word 
"  stained." 

MUD-DRAGGED  ROUGH  RICE 

Mud-dragged  rough  rice  shall  be  rough  rice 
in  which  there  are  more  than  2  per  cent  of 
kernels  with  a  distinct  amount  of  mud  clinging 
to  them. 

Mud -dragged  rough  rice  shall  be  graded  and 
designed  according  to  the  grade  requirements  of 
the  grade  applicable  to  such  rice  if  it  were  not 
mud-dragged,  and  there  shall  be  added  to  and 
made  a  part  of  such  grade  designation  the  word 
"  mud-dragged .' ' 

MUSTY  ROUGH  RICE 

Musty  rough  rice  shall  be  rough  rice  which 
has  an  unmistakable  musty  odor. 

Musty  rough  rice  shall  be  graded  and  desig- 
nated according  to  the  grade  requirements  of 
the  grade  applicable  to  such  rice  if  it  were  not 
musty,  and  there  shall  be  added  to  and  made 
a  part  of  such  grade  designation  the  word 
"musty." 

10 


MILLING    QUALITY 

Milling  quality  shall  be  based  on  the  value  of 
the  rough  rice  for  milling  purp  The  I 

for  milling  quality  shall  be  determined  by  use 
of  the  Smith  shelling  device,  described  in  mimeo- 
graph circular  USGSA-GI,  No.  34,  dated 
August,  1925,  issued  by  the  Bureau  of  Agricul- 
tural Economics,  United  States  Department  of 
Agriculture,  or  as  determined  by  any  device 
or  method  giving  equivalent  result-. 

Milling  quality  shall  be  determined  as  prime 
milling  quality,  good  milling  quality,  medium 
milling  quality,  fair  milling  quality,  ordinary 
milling  quality,  or  low  milling  quality.  The 
milling  quality  so  determined  and  stated  shall 
be  added  to  the  grade  designation. 

Examples:  Xo.  1  Blue  Rose  rough  rice,  prime 
milling  quality. 
No.  1   Blue   Rose  rough  rice,  fair 

milling  quality. 
No.  3  Blue  Rose  rough  rice,  ordi- 
nary milling  quality. 
No.  1   California-Japan  rough  rice, 

prime  milling  quality. 
No.  1   California-Japan  rough  rice, 

good  milling  quality. 
No.  3  California- Japan  rough  rice, 
prime  milling  quality. 

11 


DEFINITIONS 

Basis  of  determinations. — Each  determina- 
tion of  general  appearance,  temperature,  odor, 
moisture,  separable  foreign  material  and  finely 
broken  kernels,  milling  quality,  mud-dragged, 
and  insects  injurious  to  stored  rice  shall  be  on 
the  basis  of  the  lot  of  rice  as  a  whole.  Each 
determination  of  red  rice,  damaged  kernels,  and 
other  classes  shall  be  upon  the  basis  of  the  rice 
after  shelling.  All  other  determinations  shall 
be  upon  the  basis  of  the  rice  when  free  from 
separable  foreign  material  and  finely  broken 
kernels  and  before  shelling. 

Percentages. — Percentages,  except  in  the 
case  of  moisture,  shall  be  percentages  ascertained 
by  weight. 

Percentage  of  moisture. — Percentage  of  mois- 
ture shall  be  that  ascertained  by  the  moisture 
tester  and  the  method  of  use  thereof  described 
in  Bulletin  No.  1375,  dated  February,  1926, 
issued  by  the  United  States  Department  of 
Agriculture,  Bureau  of  Agricultural  Economics, 
or  that  ascertained  by  any  device  and  method 
giving  equivalent  results. 

Damaged  kernels. — Damaged  kernels  shall  be 
kernels  and  pieces  of  kernels  of  rough  rice  which 
have  been  distinctly  damaged  by  water,  insects, 
or  by  any  other  means.     Sound  broken  kernels 

12 


and  kernels  of  which  the  hulls  only  have  been 
damaged  shall  not  be  considered  as  damaged 
kernels. 

Heat-damaged  kernels. — Heat-damaged  ker- 
nels shall  be  kernels  and  pieces  of  kernels  of 
rough  rice  which  have  been  distinctly  discolored 
by  external  heat  or  as  a  result  of  heating  caused 
by  fermentation. 

Separable  foreign  material  and  finely  broken 
kernels. — Separable  foreign  material  and  finely 
broken  kernels  shall  be  all  matter  other  than 
rice  which  will  not  pass  through  a  No.  12  sieve 
and  all  kernels  and  pieces  of  kernels  of  rough 
rice  and  all  foreign  matter  which  will  pass 
through  a  No.  63^2  sieve. 

No.  12  sieve. — A  metal  sieve  perforated  with 
round  holes  twelve  sixty-fourths  inch  in  diameter. 

No.  63^2  sieve. — A  metal  sieve  perforated  with 
round  holes  six  and  one-half  sixty-fourths  inch 
in  diameter. 

Mud  lumps. — Mud  lumps  shall  be  lumps  of 
dried  mud  which  will  pass  through  a  No.  12 
sieve  but  which  will  not  pass  through  a  No. 
63^  sieve.  Mud  lumps  which  will  not  pass 
through  a  No.  12  sieve  or  which  will  pass  through 
a  No.  63^  sieve  shall  function  in  grading  only 
as  "  separable  foreign  material  and  finely 
broken  kernels." 

Cereal  grains. — Cereal  grains  shall  include 
barley,  rye,  wheat,  emmer,  spelt,  einkorn,  corn, 
grain  sorghums,  and  oats,  and  shall  not  include 
buckwheat,    flaxseed,    and    wild    oats.     Cereal 


13 


grains  which  will  not  pass  through  a  No.  12 
sieve  or  which  will  pass  through  a  No.  6J^ 
sieve  shall  function  in  grading  only  as  "  separable 
foreign  material  and  finely  broken  kernels." 

Weed  seeds. — Weed  seeds  shall  be  grains, 
kernels,  or  seeds,  either  whole  or  broken,  of  any 
plant  other  than  rice  or  other  cereal  grains. 
Weed  seeds  which  will  not  pass  through  a  No.  12 
sieve  or  which  will  pass  through  a  No.  6J^ 
sieve  shall  function  in  grading  only  as  "  sepa- 
rable foreign  material  and  finely  broken 
kernels." 

Red  rice. — Red  rice  shall  be  whole  or  broken 
kernels  of  rice  of  which  the  bran  is  distinctly 
red  or  pink  in  color. 


14 


IMPORTANT  FEATURES   OF  GRAD- 
ING ROUGH  RICE 


THE  SAMPLING  OF  ROUGH  RICE 

The  obtaining  of  a  representative  sample  is 
essential  to  the  determination  of  the  true  grade 
of  a  given  lot  of  rough  rice.  If  the  sample 
obtained  is  not  representative  no  amount  of 
care  in  making  determinations  for  the  grading 
factors  will  establish  the  true  grade  of  the  rough 
rice  sampled.  Consequently,  great  care  should 
be  taken  in  sampling  in  order  that  the  sample 
on  which  the  grade  of  the  rough  rice  is  to  be 
based  shall  truly  represent  the  rough  rice 
sampled. 

The  sample  should  be  approximately  2  quarts 
in  size.  If  the  time  to  elapse  between  the  draw- 
ing of  the  sample  and  the  determination  of 
grade  would  permit  of  such  change  in  the  con- 
dition of  the  sample  as  to  affect  the  grade,  at 
least  lj/g  pints  should  be  inclosed  in  an  air-tight 
container  and  the  remainder,  if  any,  in  a  clean 
cloth  sack. 

In  the  case  of  bulk  rough  rice  in  a  carload 
lot,  or  in  a  wagon,  at  least  five  probes  (with  a 
double-shell  compartment  trier  60  inches  long, 
or  one  giving  equivalent  results),  and  as  many 
more  as  may  be  necessary,  in  the  discretion  of 
the  sampler,  shall  be  taken  from  the  rice  in 
different  parts  of  the  car  or  wagon,  as  the  case 
may  be. 


24030°— 27- 


15 


In  case  of  bulk  rice  in  a  canal  boat,  barge, 
ship,  or  other  vessel  at  least  five  probes  (with 
a  double-shell  compartment  trier,  or  one  giving 
equivalent  results),  and  as  many  more  as  may 
be  necessary,  in  the  discretion  of  the  sampler, 
shall  be  taken  at  points  through  each  hatch  or 
opening  in  the  deck,  or  may  be  drawn  from  the 
spout  or  on  the  belt  or  other  conveyor  from  the 
vessel  if  taken  in  such  a  way  as  to  be  repre- 
sentative of  the  entire  lot  or  parcel. 

SAMPLING  DEVICES 

GRAIN  TRIER  (PROBE)  AND  SAMPLING  CANVAS 

For  obtaining  a  representative  sample  from  a 
carload  of  bulk  rice  the  use  of  the  double  tube, 
separate  compartment  grain  trier  (probe)  shown 
in  Figure  1  is  recommended. 

The  use  of  such  a  trier  makes  it  possible  for 
the  sampler  to  note  any  unevenness  in  loading 
and  to  ascertain  the  approximate  location  and 
quantity  of  any  mixture  of  rice  or  of  dirty,  heat- 
ing, or  damp  spots,  etc.,  found  in  any  part  of  the 
rice.  To  assist  in  doing  this  it  is  advisable  to 
use  a  canvas  5  by  2  feet  in  dimensions  on  which 
to  empty  the  grain  from  the  trier.  The  grain 
should  be  emptied  lengthwise  on  the  canvas, 
each  separate  trierful  apart  from  the  others,  so 
that  the  grain  from  each  compartment  can  be 
noted  separately. 

In  case  of  bulk  rice  being  loaded  aboard  a 
canal  boat,  barge,  ship,  or  other  vessel,  the 
sample  may  be  taken  from  the  spout  or  on  the 


16 


»§-/^/v/-*  tube 

TER    TUBE 


^  JLoV7 

vv~--^^JL-0/»£-/V//VC  IN  TUBES 


J 
PARTITION     \ 


I 


B 


Fig.  1.— Rice  trier  (probe).  Double-tubed,  separate- 
compartment  trier  (probe),  recommended  by  the 
Department  of  Agriculture.  A,  Trier  closed;  B,  trier 
open;  C,  cross  section  showing  double  tubes,  D, 
sectional  view;  and  E,  longitudinal  view,  showing 
compartments 


belt  or  other  conveyor  to  the  vessel  if  taken  in 
such  a  way  as  to  be  representative  of  the  entire 
lot  or  parcel. 

In  case  of  rice  in  sacks,  samples  shall  be  drawn 
from  as  many  individual  sacks  selected  at  ran- 
dom as  will  enable  the  sampler  to  procure  an 
average  and  representative  sample  of  the  entire 
lot.  In  case  a  lot  is  of  such  size  or  is  stacked  in 
such  a  manner  that  a  representative  sample  can 
not  be  obtained,  no  official  inspection  of  the  rice 
should  be  made  until  a  representative  portion 
of  it  is  accessible  for  sampling. 

In  case  it  shall  appear  that  a  material  portion 
of  a  lot  or  parcel  of  rice  is  in  any  manner  dis- 
tinctly inferior  to  the  remainder  of  the  lot  or 
parcel,  a  separate  sample  otherwise  complying 
with  these  instructions  shall  be  taken  from  such 
portion  and  from  the  remaining  portion.  There 
shall  be  filed  with  such  sample  a  statement  show- 
ing the  estimated  quantity  of  each  portion  of 
the  rice  from  which  each  such  sample  was  taken. 

SAMPLE  DIVIDER  (BOERNER  SAMPLER) 

After  a  representative  sample  of  the  lot  or 
parcel  of  rice  to  be  graded  is  obtained  it  is 
usually  necessary  to  reduce  its  size  considerably 
in  order  that  the  grade  may  be  determined  by 
careful  analysis.  To  reduce  the  size  of  a  sample 
of  rice  containing  foreign  substances  of  different 
specific  gravity  or  size  than  of  the  rice  with  which 
they  are  mixed  and  at  the  same  time  obtain  a 
sample  as  representative  as  the  original  is 
scarcely  possible  except  by  mechanical  means. 


18 


Fig.  2. — Modified  Boerner  sampler.  For  use  in  ob- 
taining a  representative  portion  from  a  larger  sample 
for  analyses  purposes 

19 


I 


Figure  2  shows  a  device,  generally  referred  to 
as  the  "  Modified  Boerner  sampler,"  which  will 
divide  a  sample  into  smaller  portions  and  still 
maintain  the  proper  proportions  for  the  various 
factors  of  the  original  sample.  In  the  operation 
of  this  device  the  rice  is  placed  in  a  hopper  at  the 
top  of  the  machine  and  released,  when  it  passes 
through  an  opening  at  the  bottom  of  the  hopper, 
down  the  sides  of  a  cone  the  point  of  which  is 
directly  under  the  center  of  the  opening. 
Around  the  base  of  the  cone  are  pockets  or  open- 
ings. The  rice  falling  down  the  sides  of  the  cone 
is  cut  into  separate  streams,  which,  a  little  farther 
on,  merge  into  two  streams.  Streams  Nos.  1,  3, 
5,  etc.,  unite  into  one  stream  which  empties  into 
one  receptacle,  and  streams  2,  4,  6,  8,  etc.,  unite 
into  another  stream  which  empties  into  a  second 
receptacle. 

The  device  is  fully  described  in  United  States 
Department  of  Agriculture  Bulletin  No.  857. 


20 


METHOD  OF  MAKING  MOISTURE  TESTS 

Owing  to  the  numerous  methods  of  making 
moisture  determinations  and  the  wide  variations 
in  the  results  obtained  by  the  different  methods 
the  tester  and  method  described  in  Department 
of  Agriculture  Bulletin  No.  1375,  issued  by  the 
Bureau  of  Agricultural  Economics,  United 
States  Department  of  Agriculture,  have  been 
designated  as  the  standard  on  which  the  grades 
are  based.  This  in  no  way  precludes  the  use  of 
other  methods  of  making  moisture  determina- 
tions so  long  as  the  results  are  corrected  to  con- 
form to  those  secured  by  the  standard  method 
specified.  Figure  3  gives  a  sectional  view  of  the 
official  standard  moisture  tester. 

In  making  moisture  tests,  use  the  quantities 
of  oil  and  grain  and  extinguish  the  flame  as  listed 
in  the  following  table  of  specifications: 


21 


Kind  of  grain 


Oil  in 

flask 


Rough  rice 

Brown  rice 

Head  rice  (milled). 
Second  head  rice__ 

Screenings  rice 

Brewer's  rice 

Wheat 

Shelled  corn 

Oats 

Rye 

Grain  sorghums. .. 

Barley 

Flaxseed 


C.c. 

150 
i  150 
»  150 

1  150 

2  150 
2150 

150 
150 
150 
150 
150 
150 
150 


Weight 
of  grain 
in  flask 


Grams 
100 
100 
100 
100 
100 
100 
100 
100 
3  50 
100 
100 
100 
100 


Extin- 
guish the 
flame  at — 


C. 


200 
200 
200 
200 
200 
200 
180 
190 
195 
175 
190 
190 
175 


1  Use  glass-wool  pad  2  inches  in  diameter  and  one-fourth  inch 
thick  in  bottom  of  flask. 

2  Use  double-walled  flask. 

3  Use  special  graduate  which  is  one-half  of  the  volume  of  the 
regular  graduate;  however,  the  regular  graduate  may  be  used 
by  doubling  the  moisture-test  reading. 

Special  points  for  consideration: 

(1)  Install  the  moisture  tester  in  a  place  where 
it  will  not  be  exposed  to  strong  air  currents. 

(2)  The  standard  tester  is  equipped  for  heating 
with  illuminating  gas. 

(3)  Keep  the  wire  gauze  with  asbestos  center 
in  good  condition  and  so  adjusted  that  the  flame 
plays  directly  in  the  center  of  the  asbestos. 

(4)  Place  the  flask  so  that  the  bottom  of  the 
flask  is  not  less  than  three-eighths  of  an  inch 
above  the  wire  gauze. 

(5)  See  that  the  column  of  mercury  in  the 
thermometer  is  continuous;  if  broken,  it  should 
be  shaken  down. 

(6)  Thoroughly  mix  the  sample  before  weigh- 
ing for  tests;  and  unless  the  test  is  to  be  made 
immediately  upon  its  arrival  in  the  office  place 
in  air-tight  container. 

22 


Fig.  3. — Moisture  tester.  Sectional  view  of 
the  official  moisture  tester,  showing  the 
various  parts  properly  connected  for  use; 
A,  Distillation  flask  in  position  three-eighths 
of  an  inch  above  the  wire  gauze 


I 


(7)  Make  tests  in  duplicate,  and  if  duplicates 
vary  over  three-tenths  of  1  per  cent  make  an- 
other test. 

(8)  Adjust  the  thermometers  so  that  four- 
fifths  of  the  mercury  bulb  is  submerged  in  the 
grain  and  oil  after  the  grain  has  been  placed  in 
the  flask.  (See  to  the  adjustment  each  time. 
Do  not  guess.) 

(9)  Use  correctly  graduated  thermometers 
and  graduates. 

•  (10)  Do  not  use  mushy  rubber  stoppers,  as 
they  absorb  some  of  the  moisture  that  should 
pass  into  the  graduates. 

(11)  Clean  and  dry  each  graduate  before 
using  for  a  test.  (Do  not  let  them  show  any 
moisture  in  the  bottom  or  along  the  sides.) 

(12)  Do  not  use  oil  directly  from  the  previous 
test.  Empty  used  flasks  into  a  large  storage 
can  and  never  directly  into  the  oil-measuring 
device. 

(13)  Keep  a  good  circulation  of  cold  water 
through  the  condenser  tank. 

(14)  Adjust  the  heating  apparatus  so  that  the 
required  temperature  is  reached  in  20  minutes. 
A  longer  time  will  give  results  too  low  and  a 
shorter  time  too  high. 

(15)  If  the  moisture  content  of  the  sample  is 
high  so  that  there  is  a  tendency  to  boil  over, 
lower  the  flame  until  a  considerable  portion  of 
the  water  is  distilled  over. 

(16)  Cut  off  the  heat  at  the  exact  temperature 
prescribed  for  each  grain. 

(17)  After  the  flame  is  extinguished  a  slight 
gradual  rise  in  the  temperature  is  to  be  expected. 
A  sudden  increase  or  sudden  decrease  in  tem- 

24 


perature  of  several  degrees  indicates  that  the 
flame  was  too  intense  during  the  latter  part  of 
the  heating,  and  the  test  should   be  repeated. 

(18)  Do  not  remove  covers  nor  remove  ther- 
mometers until  the  temperature  recedes  to 
160°  C. 

(19)  After  the  temperature  has  fallen  to  160° 
C.  or  lower  disconnect  thermometer  and  then 
the  deliver}'  tube. 

(20)  Read  the  percentage  of  moisture  in  the 
graduated  cylinder  after  all  the  drops  clinging 
to  the  sides  of  the  graduates  have  been  shaken 
down.  The  reading  is  taken  beneath  the  layer 
of  oil  on  top  of  the  water. 

(21)  Results  of  tests  need  not  be  expressed 
more  closely  than  one-tenth  of  1  per  cent. 

(22)  If  the  water  which  distills  over  is  dis- 
colored the  substance  has  evidently  been  burned 
and  the  test  should  be  repeated. 

(23)  When  the  machine  is  not  in  use  keep 
the  thermometers  connected  in  the  flasks  and 
the  flasks  connected  with  the  distilling  tubes  in 
the  same  manner  as  for  making  *a  test. 

(24)  Before  making  a  test  in  a  new  flask  or 
before  using  a  machine  that  has  not  been  in 
use  for  a  24-hour  period  a  test  should  be  made 
on  a  preliminary  sample  so  that  all  the  flasks 
will  be  uniform  in  condition. 

(25)  Place  scales  on  a  firm  support  and  see 
that  they  are  in  balance  before  making  a 
weighing. 

(26)  The  specific  directions  given  above  and 
in  United  States  Department  of  Agriculture 
Bulletin  No.  1375  for  making  tests  do  not  apply 
to  modified  forms  of  testers. 

25 


DETERMINATION   OF   MILLING   QUALITY 

SMITH  SHELLING  DEVICE 

The  Smith  shelling  device  illustrated  in 
Figure  4  is  recommended  for  making  shellings 
of  rough  rice  for  the  purpose  of  determining  its 
milling  quality.  The  percentage  of  admix- 
tures, red  rice,  damaged  kernels,  and  other 
factors  in  rough  rice  can  also  be  determined  more 
readily  after  the  hulls  have  been  removed  with 
the  shelling  device. 

The  Smith  shelling  device  is  fully  described 
in  mimeographed  circulars  USGSA-GI,  Nos. 
34  and  35,  issued  by  the  Bureau  of  Agricultural 
Economics,  United  States  Department  of  Agri- 
culture. 

In  making  shellings  of  rough  rice  it  is  recom- 
mended that  the  following  method  be  used: 

Use  only  samples  which  have  been  freshly 
drawn  or  samples  which  have  been  kept  in  air- 
tight containers  for  only  a  short  length  of  time. 
The  hardness  of  the  kernels  in  a  lot  will  not  be 
correctly  shown  by  a  shelling  made  of  a  sample 
of  rough  rice  which  has  been  allowed  to  remain 
in  the  open  air  or  which  has  been  stored  in  a 
paper  sack  or  similar  container. 

Use  a  50-gram  portion  of  rough  rice  for  the 
shelling.  This  portion  should  be  "cut"  from 
the  sample  by  the  vse  of  the  modified  Boerner 
sampler  illustrated  on  page  19.  Great  care 
should  be  taken  to  see  that  this  portion  is  ac- 
curately weighed. 

26 


^ 


I  ^s 


Scale  m  incha 

I  '  1 1 1 1  I .  .  I  ll) 

i   »   •    •  »  'i 


Shaft 


Scale  in  inches 
r-r    i    i    i    i    i    i     i    i    i    i    i 

Fig.  4. — Smith  shelling  device.  Used  for  rubbing  the  hulls 
off  from  the  kernels  in  samples  of  rough  rice  to  determine 
its  milling  quality,  (a)  The  device  assembled  on  a  table. 
The  dotted  lines  show  the  position  of  the  device  while  it 
is  being  emptied,  (b)  Cross  section  of  the  base  illustrat- 
ing the  hook-up  of  the  rubbing  block 


27 


Place  the  50-gram  portion  in  the  shelling 
device  and  set  the  machine  in  motion  by  starting 
the  motor.  The  device  is  equipped  with  an 
automatic  cut-off  switch  which  stops  the  machine 
after  the  rice  has  received  100  rubs.  Each 
portion  should  receive  200  rubs  when  testing  the 
rice  for  milling  quality. 

When  the  machine  stops  at  the  end  of  200 
rubs  the  rubbed  rice  is  removed  by  dumping 
the  device  down  over  the  end  of  the  table  and 
brushing  the  hulls  and  rice  into  a  pan  fastened 
to  the  end  of  the  hopper.  Care  should  be  used 
to  see  that  all  of  the  rice  and  hulls  in  the  "shell- 
ing" are  brushed  into  this  pan,  leaving  nothing 
in  the  device  and  without  losing  any  of  the 
kernels  or  hulls. 

BATES  LABORATORY  ASPIRATOR 

The  Bates  laboratory  aspirator  is  recom- 
mended for  use  in  separating  the  loose  hulls  from 
the  " rubbed"  rice.  This  apparatus  makes  it  pos- 
sible to  remove  the  loose  hulls  from  the  shelling 
without  the  loss  of  the  finely  broken  particles  of 
rice. 

After  the  loose  hulls  have  been  removed  from 
the  shelling  the  remaining  portion  may  be  ana- 
lyzed for  who  leand  broken  kernels,  red  rice,  and 
damaged  kernels,  or  any  other  factor  which  is 
more  readily  determined  with  the  hulls  removed. 

Plans  and  specifications  for  constructing  the 
Bates  laboratory  aspirator  may  be  obtained 
without  cost  from  the  Bureau  of  Agricultural 
Economics,  United  States  Department  of 
Agriculture. 

28 


\RiCE,/ 


Fig.   5. — Bates  laboratory  aspirator.    Used  for  removing 
the  hulls  from  rubbed  samples  (shellings)  of  rough  rice 


29 


SIEVES      HELPFUL     IN     DETERMINING     MILLING 

QUALITY 

In  the  determination  of  whole  and  broken 
kernels  the  use  of  a  No.  6J^  sieve  and  also  a 
No.  5J^  sieve  will  be  found  helpful.  Most  of 
the  broken  kernels  can  be  removed  from  the 
shelling  with  the  sieves  and  the  remaining  broken 
kernels  can  then  be  readily  separated  from  the 
whole  kernels  by  hand  picking. 


30 


METHOD  OF  DETERMINING  FOREIGN 
MATERIAL  AND  FINELY  BROKEN  KER- 
NELS 

EQUIPMENT  FOR  MAKING  THE  SEPARATION 

In  determining  the  quantity  of  foreign  material 
and  finely  broken  kernels  in  connection  with  the 
grading  of  rough  rice  the  following  equipment  is 
used: 

Set  of  perforated  metal  hand  sieves.  The 
sieves  and  bottom  pan  should  be  circular  in 
shape  and  made  of  aluminum,  brass,  or  other 
suitable  material.  The  smooth  surface  of  the 
metal  in  the  sieves  should  be  face  up.  The 
metal  should  be  0.025  to  0.035  inch  in  thickness. 

(a)  Bottom  pans:  The  inside  diameter  across 
the  top  of  the  pan  should  be  13%  inches;  the 
inside  diameter  across  the  bottom  of  the  pan 
should  be  13  inches;  depth  2^  inches;  and  roll 
at  top  of  pan  ^  inch  in  diameter. 

(6)  No.  6^2  sieve:  With  round  perforations 
six  and  one-half  sixtv-fourths  inch  in  diameter; 
inside  diameter  across  the  top  of  the  sieve  should 
be  13%  inches;  inside  diameter  across  the  bot- 
tom of  the  sieve  should  be  13  inches;  depth  IJ/g 
inches;  and  roll  at  top  of  sieve  ^  inch  in  diam- 
eter. 

(c)  No.  12  sieve:  With  round  perforations  £f 
inch  in  diameter;  inside  diameter  across  the  top 


31 


of  the  sieve  should  be  13^4  inches,  inside  diam- 
eter across  the  bottom  of  the  sieve  should  be  13 
inches;  depth  1%  inches;  and  roll  at  top  of 
sieve  ^  inch  in  diameter. 

Note. — The  No.  6H  sieve  should  be  made  to  nest  very  freely 
with  the  bottom  pan.  The  No.  12  sieve  should  be  made  to  nest 
very  freely  with  the  No.  6M  sieve. 

It  is  absolutely  essential  that  the  dimensions 
of  the  perforations  of  the  sieves  used  be  exactly 
as  stated  above.  A  slight  variation  in  the  dimen- 
sions materially  influences  the  percentage  of 
matter  which  will  pass  through  the  sieve.  To 
secure  the  exact  size  it  is  necessary  that  the  per- 
forations be  cut  with  dies  especially  made  for  the 
purpose.  Sieves  made  from  tin  or  galvanized 
iron  with  an  ordinary  punch  will  not  give  accu- 
rate results.  The  shape  and  arrangement  of  the 
perforations  are  shown  in  Figure  6,  and  the 
manner  of  nesting  of  the  sieves  is  shown  in 
Figure  7.   . 


No  6/2 


No.12 


Fig.  6. — Illustrating  the  perforations  (full  size)  for  the 
No.  6)4  and  No.  12  sieves  adopted  by  the  United  States 
Department  of  Agriculture  in  connection  with  the 
grading  of  rough  rice 

32 


Fig.  7.— Xest  of  two  sieves  and  bottom  pan.  Bottom  pan 
has  an  inside  diameter  of  13  inches  and  is  2j^  inches  deep. 
The  No.  6H  sieve  nests  freely  with  the  bottom  pan  and 
is  lj'8  inches  deep.  The  No.  12  sieve  nests  freely  with 
the  No.  6H  sieve  and  is  1%  inches  deep 

METHOD  FOR  MAKING  THE  DETERMINATION 

The  following  method  for  determining  foreign 
material  and  finely  broken  kernels  in  rough  rice 
should  be  used: 

Not  less  than  50  grams  and  preferably  100 
grams  of  the  original  sample  should  be  used  for 
screening.  The  portion  should  be  shaken  on 
the  nest  of  sieves  and  bottom  pan  until  it  is 
apparent  that  no  more  material  will  pass  through 
the  sieves. 


33 


Kernels  of  rice,  either  single  or  in  clusters, 
which  remain  on  the  No.  12  sieve  after  screening 
should  be  removed  and  placed  with  the  rice 
which  remains  on  the  No.  6J^  sieve. 

The  mud  lumps,  cereal  grains,  weed  seeds,  and 
other  foreign  material  remaining  on  the  No.  12 
sieve  after  screening  and  all  of  the  material  of 
every  land  passing  through  the  No.  6J^  sieve 
function  as  separable  foreign  material  and  finely 
broken  kernels. 

A  representative  portion  of  at  least  50  grams 
of  the  rice  remaining  on  the  No.  6J^  sieve  after 
screening  should  be  analyzed  for  mud  lumps, 
cereal  grains,  and  weed  seeds.  Mud  lumps  and 
cereal  grains,  when  found  in  this  portion  of  rice, 
are  grading  factors,  and  the  sample  should  be 
graded  for  each  of  these  factors  according  to  the 
limits  prescribed  in  the  grades  on  pages  3  and  5. 
Weed  seeds,  when  found  in  excess  of  0.5  per  cent 
for  the  subclass  California- Japan  and  0.1  per 
cent  for  all  other  rices,  after  the  removal  of 
separable  foreign  material  determine  whether  a 
sample  is  "seedy"  or  "very  seedy"  as  stated  on 
pages  8  and  9. 

Great  care  should  be  used  in  sieving  the 
samples  as  the  limits  for  mud  lumps,  cereal 
grains,  and  weed  seeds  left  in  the  rice  after 
screening  are  much  more  stringent  than  the 
limits  for  separable  foreign  material  and  finely 
broken  kernels.  In  so  far  as  possible  the  foreign 
material  should  be  removed  with  the  sieves. 


34 


APPARATUS  FOR  GRADING  ROUGH  RICE 

To  equip  laboratories  for  the  grading  of  rough 
rice  according  to  the  United  States  grades  for 
rough  rice  the  following  equipment  is  regarded 
as  essential: 

1.  Brown- Duvel  moisture  tester,  completely 
equipped  with  flasks;  certified  centigrade  ther- 
mometers to  read  correctly  from  170  to  200°; 
graduates  of  25  c.  c.  capacity;  one-hole  rubber 
stoppers,  sizes  Xos.  5  and  3;  condenser  tubes; 
150  c.  c.  oil  measuring  device;  supply  of  oil,  etc. 
(See  United  States  Department  of  Agriculture 
Bulletin  No.  1375.) 

2.  Balance,  capacity  500  grams,  sensitive  to 
one-tenth  gram,  wath  set  of  weights,  1  gram  to 
500  grams. 

3.  Balance, 'capacity  approximately  50  grams, 
graduated  beam  to  read  1  gram  and  fractions  of 
a  gram,  sensitive  to  one-tenth  gram,  with  set  of 
weights  1  gram  to  50  grams. 

4.  Sieves  and  pan  for  use  in  the  determination 
of  " foreign  material  and  finely  broken  kernels' ' 
in  rough  rice: 

(a)  Bottom  pan:  The  inside  diameter  across 
the  top  of  the  pan  should  be  13%  inches;  the 
inside  diameter  across  the  bottom  of  the  pan 
should  be  13  inches;  depth  2^  inches;  and  roll 
at  top  of  pan  ^  inch  in  diameter. 

(6)  No.  63^>  sieve:  With  round  perforations 
six  and  one-half  sixty-fourths  inches  in  diameter; 

35 


inside  diameter  across  the  top  of  the  sieve  should 

be  13%  inches;  inside  diameter  across  the  bottom 

of  the   sieve  should   be   13   inches;   depth,    1% 

inches;   and   roll   at   top   of   sieve,    x§   inch  in 

diameter. 

(c)  No.    12    sieve:  With    round    perforations 

-Jf  inch  in  diameter;  inside  diameter  across  the 

top  of  the  sieve  should  be  13%  inches;  inside 

diameter  across  the  bottom  of  the  sieve  should 

be'  13  inches;  depth,  1%  inches;  and  roll  at  top 

of  sieve  ^  inch  in  diameter. 

Note. — The  No.  6K  sieve  should  be  made  to  nest  very  freely 
with  the  bottom  pan.  The  No.  12  sieve  should  be  made  to  nest 
very  freely  with  the  No.  6^  sieve. 

5.  A  modified  Boerner  sampler  for  correctly 
dividing  a  sample  into  smaller  portions  for 
analysis  and  moisture  determinations.  (See 
United  States  Department  of  Agriculture 
Bulletin  No.  857.) 

6.  Trier  for  bulk  rough  rice.  The  trier  should 
be  double-shelled  and  divided  into  compartments, 
and  should  be  60  inches  long. 

7.  Sampling  canvas,  5  by  2  feet  in  dimensions, 
on  which  to  empty  the  rice  from  the  trier. 

8.  Trier  for  sacked  rough  rice. 

9.  Air-tight  containers  (sample  cans),  capacity 
approximately  450  grams. 

10.  Cloth  sample  bags,  waterproofed,  capacity 
at  least  2  quarts. 

11.  Grain  pans,  with  spout  for  pouring  into 
other  containers. 

12.  Smith  shelling  device,  equipped  with  motor 
and  automatic  cut-off  switch. 


36 


13.  Laboratory  aspirator  for  removing  loose 
hulls  from  shellings  of  rice. 

In  addition  to  the  apparatus  listed  above,  the 
following  equipment  will  be  found  convenient 
and  desirable: 

1.  Extra  moisture-testing  equipment:  Flasks, 
thermometers,  graduates,  rubber  stoppers,  test- 
tube  cleaners,  etc. 

2.  Five-gallon  oil  can  equipped  with  faucet. 

3.  Five-gallon  oil  can  equipped  with  strainer 
funnel  to  recover  oil. 

4.  Five-gallon  refuse  can. 

5.  Small  funnel  to  fit  in  moisture  flasks  for 
pouring  sample  into  the  flasks. 

6.  Tweezers  for  mechanical  analvsis. 

7.  Small  grain  scoop. 

8.  Brush  for  cleaning  up  rice  and  rice  dust. 

9.  Heavy  table  for  handling  samples,  analysis, 
etc. 

10.  Furniture,  including  chairs,  stationery 
supplies,  files,  etc.,  to  keep  proper  records. 

FURTHER  INFORMATION 

For  further  information  regarding  the  inspec- 
tion and  grading  of  rough  rice  in  accordance  with 
the  provisions  of  the  United  States  grades  for 
rough  rice  apply  to  any  Federal  field  office  of 
rice  investigations  or  to  the  Bureau  of  Agricul- 
tural Economics,  United  States  Department  of 
Agriculture,  Washington,  D.  C. 

o 


37 


UNIVERSITY  OF  FLORIDA 


3  1262  08930  1 


393 


^ 


